The three most reliable signs: the face and tail pattern — normal grey males grow a yellow face and lose the tail bars at the first adult moult, about 6–12 months (Lafeber; VCA: adult colours by 9–12 months); the beak — horn-coloured in juveniles, grey in adults (World Parrot Trust); and the tail and crest — short until about a year. After the first moult only a closed leg band shows the exact year.
A guide, not a birth certificate. Cockatiels mature at different speeds and colour mutations mask several signs, so treat every range here as approximate. A breeder or avian vet who sees the bird in person can usually do better.
Cockatiel age chart
This cockatiel age chart lines up the signs that change as a cockatiel grows, from the nest to adulthood. Ages are approximate: sources differ by a few weeks, individual birds vary, and the face and tail columns apply to normal grey birds only.
| Age | Beak | Crest | Tail | Face and tail pattern (normal grey) | Feet | Behaviour |
|---|---|---|---|---|---|---|
| 0–5 weeks in the nest | Pale horn colour; egg tooth for the first days | Grows in as quills from about days 10–12 | Still short when fully feathered at about 4 weeks | Down, then quills; both sexes look alike | Smooth | Fed by the parents; fledges at about 5 weeks |
| 6–12 weeks weaning | Horn-coloured, tinged grey | Short, straight and spiky | Shorter than an adult's | Juvenile: muted face and cheeks, barred tail | Smooth | Learning to eat alone: about 8 weeks (parent-raised) to 12 (hand-fed) |
| 3–6 months | Horn-coloured, tinged grey | Short to medium | Shorter than an adult's | Juvenile pattern — males still look like hens | Smooth, short clear nails | Explores and chews; no reliable age-specific behaviour |
| 6–12 months | Turning adult colour | Lengthening | Growing to full length | First adult moult: males get the yellow face and solid grey tail; adult colours by 9–12 months | Smooth to about 9 months | Sexually mature at about 8–12 months |
| 1–2 years | Adult grey (normal grey birds) | Full length, curving back | Full length, longer than the body | Adult pattern settled | Scales starting to show | Adult; breeding best left until 18 months (cocks) or 2 years (hens) |
| Over 2 years | Adult; may look worn | Full | Full | Adult | Scalier, with thicker, longer nails | Looks the same at 3 as at 13 |
Read across each row and look for the one where most of your bird's features match. The face and tail pattern and the beak are the strongest clues; crest, tail length and feet are weaker. If one feature disagrees, trust the stronger ones. The chart is most useful in the first year, which is exactly when owners most often wonder "how old is my cockatiel?" — most pet-shop cockatiels are sold young.
Sources: World Parrot Trust (juvenile beak), Lafeber and VCA (first moult, adult colours, maturity), the American Cockatiel Society (nest development), and pet-care sites Hepper and Cotwer for crest, tail and feet, which no veterinary source covers.
Baby cockatiel age chart: chick development week by week
A cockatiel chick changes almost daily, so this baby cockatiel age chart — a guide to cockatiel development week by week — is the most precise part of the page. Breeders date chicks by these milestones; the American Cockatiel Society's photo diary of two chicks is the clearest record of the first month.
| Age | Milestone | Source |
|---|---|---|
| Before hatching | Eggs are incubated for about 19–21 days by both parents (ADW gives 17–23) | LafeberVet; ADW |
| Days 1–3 | Yellow down, eyes sealed, egg tooth still visible on the beak | American Cockatiel Society |
| About day 8 | Eye slits start to open | American Cockatiel Society |
| Days 10–12 | Pin feathers (quills) show on the wings and the crest starts as quills; eyes fully open by about day 12 | American Cockatiel Society |
| Days 16–18 | Wings fully quilled; the down is thinning out | American Cockatiel Society |
| Days 21–28 | Chest, head and body quilled, then fully feathered by about days 26–28 — tail still short | American Cockatiel Society |
| Days 32–38 (about 5 weeks) | Fledging: first flights out of the nest box | LafeberVet; World Parrot Trust |
| Weeks 6–8 | Parent-raised chicks wean at about 42–52 days; Lafeber says about 8 weeks | LafeberVet; Ask Lafeber |
| Up to about 12 weeks | Most hand-fed cockatiels are weaned by about 12 weeks; some faster, some slower | Ask Lafeber |
Cockatiel growth stages in the first month
- Week 1: a hatchling covered in yellow down, eyes sealed, fed by both parents. The eye slits start to open at about day 8.
- Week 2: eyes fully open by about day 12; pin feathers (quills) appear on the wings, and the crest starts as a row of quills.
- Week 3: wings fully quilled and the down thinning; quills spreading over the body.
- Week 4: fully feathered by about days 26–28, but the tail is still short.
- Weeks 5–12: fledging at about 5 weeks (32–38 days, LafeberVet), then weaning — about 6–8 weeks for parent-raised chicks and up to about 12 for hand-fed ones (Lafeber).
Chicks vary: a large clutch, a cool nest or a sick chick can slow every stage. If a chick's eyes are still closed at two weeks, or it is losing weight while weaning, an avian vet should see it.
How to tell the age of a cockatiel
To work out how to tell how old a cockatiel is, look at five features, in this order of usefulness. Young cockatiels change fast; adults hardly change at all, which is why the answer gets less precise after the first year.
Face and tail pattern (normal grey)
The best single sign. Young cockatiels of both sexes look like adult hens: muted cheeks, a pale face and a barred tail. The World Parrot Trust describes the immature male as "as in adult female". At the first adult moult, males grow the bright yellow face and orange cheek patch and lose the tail bars, so the underside of the tail turns solid grey (VCA). A bird with a full yellow face is therefore at least about 6 months old. Hens keep the barred tail and muted face for life, so a hen-like pattern can mean either a youngster or an adult female.
Cockatiel age by beak
The World Parrot Trust describes the juvenile's beak as "horn-coloured … tinged with grey", against the solid grey of an adult normal grey. Pet-care guides add that a young bird's beak looks bigger because the short feathers around it leave more of it exposed. A pale, horn-coloured beak in a normal grey bird suggests under a year old. Lutino and fallow cockatiels have pinkish-white beaks all their lives (Wikipedia, cockatiel colour genetics), so the beak can't be used for them.
Cockatiel age by crest
The crest grows in as quills from about days 10–12 (American Cockatiel Society). Young birds have short, straight, spiky crests, while adults' crests are longer and curve back at the tip (Hepper). It's a useful clue in the first months, but crest length varies between birds, so it carries little weight in the estimate.
Tail length
A chick is fully feathered at about four weeks with a short tail that is still growing in. Pet-care guides say cockatiels under a year old have shorter tails than adults, about as long as the body, and that the tail grows longer than the body in adults. A stubby tail almost certainly means a chick under about 2 months.
Cockatiel age by feet
Young cockatiels have smooth skin on their legs and feet with short, clear nails; older birds' feet become scalier, with thicker, longer nails (Hepper). One pet-care guide puts smooth, thin legs at up to about 9 months and clearly scaly feet at about 1–2 years and older (Cotwer). Feet change gradually and vary with perches and health, so treat them as a supporting sign only.
How to tell if a cockatiel is young or old
Young: a horn-coloured beak, a short spiky crest, a short tail and smooth feet. Adult: a grey beak, a full curved crest, a long tail and — in a normal grey male — a yellow face. Old age itself shows mainly through health changes, such as cloudy eyes and a weaker grip, which Merck lists as common in older birds; those are reasons to see a vet rather than reliable age markers.
Eyes and whistling: why they're not in the estimator
Many websites say a cockatiel's eye colour changes with age, and that males start whistling at a certain age. We couldn't find a veterinary, academic or society source that gives ages for either. Animal Diversity Web notes only that males sing mating songs; owner reports put the start of practice singing anywhere from 2 to 4 months. So neither sign is used, and when do cockatiels start whistling remains an "it varies" answer.
When do cockatiels get their adult colours?
Cockatiels get their adult colours at the first adult moult. Lafeber says all cockatiels have hen-like markings until that moult, which comes somewhere between 6 months and a year, and that males start showing male markings at about 6–8 months. VCA says "mature coloring occurs after the first molt, around 9–12 months." So the cockatiel first moult age is about 6–12 months, and the full adult look is in place by about a year.
When do male cockatiels get yellow faces?
In normal grey birds, yellow feathers start to come through on a male's face at about 6–8 months (Lafeber) and the bright yellow face is complete by about 9–12 months (VCA). At the same time the bars on the underside of his tail are replaced by solid grey. Females keep the barred tail and a paler face for life.
Males vs females, normal grey vs mutations
- Normal grey: the moult signs above work well. Wikipedia's colour-genetics article notes that cheek patches are muted in females and young birds and vivid in adult males.
- Lutino: the hardest colour to sex by sight. Adult males have plain white tail undersides, while hens and young birds of both sexes show yellow bars or dots — useful only if you can check closely.
- Pied: pied patches can hide the face and tail markings, and pieds are notoriously hard to sex visually.
- Whiteface: no yellow or orange at all. Cocks get a brilliant white face; hens have a mostly grey face.
- Pearl: males lose most of their pearl pattern soon after the first moult, while hens keep it — an extra clue for that colour.
Using a leg band to find a cockatiel's age
If you're wondering how to tell a cockatiel's age by its leg band, first check what kind of band it is. A closed band is a solid ring with no gap. It can only be slipped over a chick's foot in its first days of life, before the foot grows too big — the same rule that applies to every bird. Many breeders use closed bands that show the hatch year.
- Find the hatch year: it's often stamped as "23" or "2023" among letters and numbers. Type the full four-digit year into the calculator's band mode.
- One year, twelve possible months: because the month isn't recorded, a bird banded 2023 is somewhere between 2.8 and 3.8 years old today.
- Layouts vary: BirdTricks notes that, apart from club-issued bands, there's no standard order for the breeder code, year and ID — the breeder or club can decode it.
- An open ring is no evidence: a band with a gap can be clipped onto an adult bird, so it says nothing about hatch year.
Not every cockatiel has a band, and we couldn't find a society-published day count for banding cockatiel chicks (breeder sites say roughly the first two weeks). Never try to remove a band yourself; an avian vet can do it safely if it's tight.
Why an adult cockatiel's exact age can't be told
After the first adult moult, a cockatiel's plumage, beak and crest stop changing. Cockatiels don't go grey, have no teeth to wear down and no growth rings to count. Feet do get scalier, but slowly and unevenly. So once your bird is about a year old, the honest answer is "an adult of unknown age" unless you have a closed band or breeder records.
That matters for planning: a rehomed adult could be 2 or 15. A well-kept cockatiel typically lives 10–14 years or more, so to see how much of that an adult of a given age has used, try the cockatiel lifespan calculator.
Cockatiel age in human years
We looked for a credible way to convert cockatiel years to human years and found none from an avian vet, university or bird society. Simple multipliers ignore how quickly cockatiels mature — sexually mature before their first birthday — and how variable adult life is, so they would be invented numbers.
How this cockatiel age estimator works
Each answer stands for an age range in months, taken from the sources above. The estimator overlaps those ranges, strongest sign first (face and tail pattern, beak, tail length, crest, then feet). If an answer contradicts the signs before it, it's left out and the result says which.
| Sign | Answers and age ranges | Weight |
|---|---|---|
| Face and tail pattern (normal grey only) | Juvenile pattern: 0–12 months Adult male: 6+ months Adult female, or can't tell: any age | 3 |
| Beak | Chick beak: 0–12 months Adult beak: 9+ months | 2 |
| Tail length | Stubby, still growing in: 0–2 months Shorter than an adult's: 1–12 months Full length: 12+ months | 2 |
| Crest | Short or still growing: 0–12 months Full length: 9+ months | 1 |
| Feet and legs | Smooth: 0–9 months Slightly scaly: 9–24 months Clearly scaly: 12+ months | 1 |
The result is placed in a band — under 3 months, 3–6 months, 6–12 months, 1–2 years, or "adult" (9 months or older with no upper limit). Confidence is high when the strong signs agree, and drops when a sign contradicts the others or is hidden by a colour mutation; "adult female or can't tell" adds no weight because hens look the same at any age. For example, a juvenile pattern, chick beak, stubby tail, short crest and smooth feet give "Under 3 months" (high confidence); swap the stubby tail for a short one and it becomes "3–6 months"; a yellow-faced male with a chick beak gives "6–12 months" (high); a full adult male with slightly scaly feet gives "1–2 years" (high), and with clearly scaly feet "Adult — exact age can't be told from looks". The same answers for a lutino give "1–2 years" with low confidence. In leg-band mode the age runs from 31 December to 1 January of the band year.
Frequently asked questions
How can I tell how old my cockatiel is?
Check the face and tail pattern, beak, tail, crest and feet. A horn-coloured beak, short spiky crest and short tail mean a young bird; a yellow face in a normal grey male means at least about 6 months. A closed leg band gives the hatch year.
When do male cockatiels get their yellow faces?
At the first adult moult. Yellow starts to come through at about 6–8 months (Lafeber), and the full yellow face and solid grey tail are in place by about 9–12 months (VCA).
At what age is a cockatiel fully grown?
A chick is fully feathered at about 4 weeks and fledges at about 5 (ACS, LafeberVet). It has adult colours after the first moult, at about 9–12 months (VCA), and is sexually mature at about 8–12 months.
When do cockatiels have their first moult?
The first adult moult comes at about 6–12 months (Lafeber). VCA says mature colouring appears after it, at about 9–12 months.
Can you tell a cockatiel's age by its feet?
Only roughly. Young cockatiels have smooth legs and short, clear nails; older birds' feet are scalier with thicker nails (Hepper). One guide puts smooth legs at up to about 9 months.
Can you tell a cockatiel's age by its beak?
In normal grey birds, yes for youngsters: the World Parrot Trust says juveniles have a horn-coloured beak tinged with grey, which becomes adult grey. Lutinos keep a pale beak for life.
How old are baby cockatiels when they open their eyes?
The eye slits start to open at about day 8 and are fully open by about day 12 (American Cockatiel Society).
When do baby cockatiels wean?
Parent-raised chicks wean at about 42–52 days (LafeberVet), or about 8 weeks; most hand-fed cockatiels are weaned by about 12 weeks (Lafeber).
How do I read a cockatiel's leg band?
Look for a two- or four-digit year among the breeder or club letters and the bird's ID number. That year is when the chick hatched — but only a seamless (closed) band proves it, because open bands can go on at any age.
Is my cockatiel male or female?
In normal greys, after the first moult: males have a bright yellow face and a solid grey tail underside, females a paler face and a barred tail (VCA). Before that, all young birds look like hens.
When do cockatiels start whistling?
We found no veterinary or academic source that gives an age. Owner reports say young males start practising song at about 2–4 months, but it varies widely.
How old is my cockatiel in human years?
Nobody has published a reliable conversion: we checked avian-vet, academic and bird-society sources and found none. The estimator gives a real age range and life stage instead of a made-up multiplier.
This calculator gives an estimate for education and fun. Every pet ages differently — for health decisions, talk to your veterinarian.